Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu van » hieu va, thien van, lieu va
thuc day » thuc dan, thuc vat
hanh hai » thanh hai, nhanh hai, hang hai
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van cau » van dau, van hau, van chat
truc va » thuc va, thuc vat, trung va
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ky nang xa hoi. hieu van cau ((truc va) or (thuc day)) hanh hai ((cuu tre) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang xa hoi. hieu van cau ((truc va) OR (thuc day)) hanh hai ((cuu tre) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang xa hoi. hieu van cau ((truc va) or (thuc day)) hanh hai ((cuu tre) or (cua tre))*.